#!/usr/bin/perl # VDR SVDRP Peer Demo # # This script broadcasts an SVDRP discover datagram on the SVDRP UDP port and # then listens for replies from peer VDRs on both the UDP and TCP port. # It reacts properly to the SVDRP commands CONN, LSTT, POLL, PING and QUIT, # and thus seems like a regular VDR to other VDRs. # # (C) 2018 by Klaus Schmidinger use Getopt::Std; use IO::Socket; use IO::Select; $DefaultSvdrpPort = 6419; $DefaultSvdrpName = "peerdemo"; $Usage = qq{ Usage: $0 options Options: -n name use the given VDR name (default: $DefaultSvdrpName) -p port use the given TCP port (default: $DefaultSvdrpPort) -v be verbose }; die $Usage if (!getopts("n:p:v")); $Name = $opt_n || $DefaultSvdrpName; $Port = $opt_p || $DefaultSvdrpPort; $Verbose = $opt_v || 0; # Open TCP and UDP sockets: $TcpPort = $Port; $UdpPort = $DefaultSvdrpPort; $TcpSocket = new IO::Socket::INET(Listen => 5, LocalPort => $TcpPort, Proto => "tcp", ReusePort => 1) || die "$!"; $UdpSocket = new IO::Socket::INET( LocalPort => $UdpPort, Proto => "udp", ReusePort => 1) || die "$!"; $SvdrpSelect = new IO::Select($TcpSocket); setsockopt($UdpSocket, SOL_SOCKET, SO_RCVTIMEO, pack('L!L!', 0, 1000)); # 1ms timeout on UDP socket # Send UDP broadcast: $BcastSocket = new IO::Socket::INET(PeerAddr => '255.255.255.255', PeerPort => $UdpPort, Proto => "udp", Broadcast => 1) || die "$!"; $BcastMsg = "SVDRP:discover name:$Name port:$TcpPort vdrversion:20309 apiversion:20309 timeout:300"; Log('>', $BcastSocket, $BcastMsg); print($BcastSocket $BcastMsg); $BcastSocket->close(); # Listen on UDP and TCP socket: while (1) { if ($UdpSocket->recv($Request, 1024)) { if (Extract($Request, "name") ne $Name) { Log('<', $UdpSocket, $Request); ReportVDR($Request, $UdpSocket->peerhost()); } } if (my @Ready = $SvdrpSelect->can_read(0.01)) { for my $fh (@Ready) { if ($fh == $TcpSocket) { # accept connection: my $new = $TcpSocket->accept(); Log('<', $new, "incoming TCP connection"); # send mandatory response to simulate an SVDRP host: my $Prompt = "220 $Name SVDRP VideoDiskRecorder 2.3.9; Wed Nov 29 17:00:29 2017; ISO-8859-1"; Log('>', $new, $Prompt); print($new "$Prompt\n"); # add incoming connection to select: $SvdrpSelect->add($new); } else { # process connection: my $Request = ""; $fh->recv($Request, 1024); chomp($Request); Log('<', $fh, $Request); if ($Request =~ /^CONN/) { Reply($fh, "250 OK"); ReportVDR($Request, $fh->peerhost()); } elsif ($Request =~ /^LSTT/) { Reply($fh, "550 No timers defined"); } elsif ($Request =~ /^POLL/) { Reply($fh, "250 OK"); } elsif ($Request =~ /^PING/) { Reply($fh, "250 $Name is alive"); } elsif ($Request =~ /^QUIT/) { # close connection: $SvdrpSelect->remove($fh); $fh->close; } } } } } # Tools: sub Reply { my ($fh, $s) = @_; Log('>', $fh, $s); print($fh "$s\n"); } sub ReportVDR { my $s = shift; my $PeerHost = shift; $s .= " "; # for easier parsing my $Name = Extract($s, "name"); my $Port = Extract($s, "port"); my $VdrVersion = Extract($s, "vdrversion"); my $ApiVersion = Extract($s, "apiversion"); my $Timeout = Extract($s, "timeout"); print("found VDR '$Name' at $PeerHost with SVDRP port '$Port'\n"); } sub Extract { my ($s, $n) = @_; return ($s =~ / $n:([^ ]*) /)[0]; } sub Log { return unless ($Verbose); my ($Dir, $Socket, $Msg) = @_; printf("SVDRP %s [%s:%s] %s\n", $Dir, $Socket->peerhost(), $Socket->peerport(), $Msg); }